Introduction to Chemical Abundances
Sentence Examples
Discover more insights into Chemical Abundances
Keywords frequently search together with Chemical Abundances
Narrow sentence examples with built-in keyword filters
Chemical Abundances sentence examples within high resolution spectra
For a detailed analysis of stellar chemical abundances, high-resolution spectra in the optical have mainly been
used, while the development of near-infrared (NIR) spectrograph has opened new wavelength windows.
Full Text
Multiple codes are available to derive atmospheric parameters and individual chemical abundances from high-resolution spectra of AFGKM stars.
Full Text
Chemical Abundances sentence examples within Detailed Chemical Abundances
We have used high resolution spectra obtained with HARPS-N@TNG for HD 344787 and the more famous Polaris DCEP, to infer their detailed chemical abundances.
Full Text
Detailed chemical abundances of light elements as well as heavy neutron-capture elements have been determined for our 22 stars.
Full Text
Chemical Abundances sentence examples within Precise Chemical Abundances
Precise chemical abundances allow us to confront the theoretical yields for AGB stellar masses and metallicities expected at the bright end of the PNLF.
Full Text
Context: Precise chemical abundances coupled with reliable ages are key ingredients to understand the chemical history of our Galaxy.
Full Text
Learn more from Chemical Abundances
Chemical Abundances sentence examples within Present Chemical Abundances
We present chemical abundances for 21 elements (from Li to Eu) in 150 metal-poor Galactic stars spanning −4.
Full Text
We present chemical abundances for the elements carbon, sodium, and fluorine in 15 red giants of the globular cluster M4, as well as six red giants of the globular cluster ω Centauri.
Full Text
Chemical Abundances sentence examples within Individual Chemical Abundances
In order to make progress on these issues, its important to collect high-resolution spectroscopic data to determine their fundamental parameters and individual chemical abundances.
Full Text
For the brightest RVS targets, stellar atmospheric parameters and individual chemical abundances are automatically estimated by the Generalized Stellar Parametriser spectroscopy group (GSP-Spec).
Full Text
Chemical Abundances sentence examples within Derived Chemical Abundances
We derived chemical abundances of carbon from two atomic lines for 757 FGK stars in the HARPS-GTO sample, observed with high-resolution (R ∼ 115000) and high-quality spectra.
Full Text
However the derived chemical abundances do not show significant indications of mixing when adopting baseline values typical for the system environment.
Full Text
Chemical Abundances sentence examples within Stellar Chemical Abundances
For a detailed analysis of stellar chemical abundances, high-resolution spectra in the optical have mainly been
used, while the development of near-infrared (NIR) spectrograph has opened new wavelength windows.
Full Text
As is the case for the one other galaxy dominated by $r$-process enhanced stars, Reticulum II, Tucana III's stellar chemical abundances are consistent with pollution from ejecta produced by a binary neutron star merger, although a different $r$-process element or dilution gas mass is required to explain the abundances in these two galaxies if a neutron star merger is the sole source of $r$-process enhancement.
Full Text
Chemical Abundances sentence examples within Derive Chemical Abundances
Among them, the ionizing stellar populations and the gas geometry make the recipes designed to derive chemical abundances from nebular emission lines to differ from those calibrated in the Local Universe.
Full Text
We model the stellar continuum to derive chemical abundances and measure gas-phase abundances with standard nebular diagnostics.
Full Text
Chemical Abundances sentence examples within Cluster Chemical Abundances
The Open Cluster Chemical Abundances from Spanish Observatories (OCCASO) survey aims to complement all this work by determining OCs accurate radial velocities and chemical abundances from high-resolution, R≥60 000, spectra.
Full Text
The study of open-cluster chemical abundances provides insights on stellar nucleosynthesis processes and on Galactic chemo-dynamical evolution.
Full Text
Chemical Abundances sentence examples within Photospheric Chemical Abundances
Chemical Abundances sentence examples within Different Chemical Abundances
We found that the CO/H2O mixing ratio of 2I/Borisov changed drastically before and after perihelion, indicating the heterogeneity of the cometary nucleus, with components formed at different locations beyond the volatile snow-line with different chemical abundances.
Full Text
To explore the metallicity-dependence of mass loss we calculate model grids at three different chemical abundances.
Full Text
Chemical Abundances sentence examples within chemical abundances derived
Shallower metallicity gradients derived from HII regions produce unreasonably large corrections, suggesting that the use of chemical abundances derived from such tracers as a proxy for Cepheid metallicity is unreliable.
Full Text
This new FLAMES sample offers a sufficiently large number of stars with chemical abundances derived at high accuracy to firmly establish the existence of a plateau in [$\alpha$/Fe] at $\sim 0.
Full Text
Chemical abundances in the X-ray halos (also known as the intracluster medium, ICM) of clusters and groups of galaxies can be measured via prominent emission line features in their X-ray spectra.
Full Text
We study the mass-size plane of galaxies in cosmological hydrodynamical simulations, as a function of velocity dispersion, age, chemical abundances, ellipticity and spin parameters with the aim at assessing to what extent the current cosmological paradigm can reproduce these observations and provide a physical interpretation of them.
Full Text
Currently, observations show that the presence of planetary companions is closely linked to the metallicity and the chemical abundances of the host stars.
Full Text
which are caused by bimodal populations in age and/or chemical abundances, eMSTOs are believed to be owing to stellar rotation.
Full Text
On the other hand, the mean spectrum was fit with spectral synthesis to derive atmospheric parameters and chemical abundances.
Full Text
In clusters of galaxies, the red sequence is believed to be a consequence of a correlation between stellar mass and chemical abundances, with more massive galaxies being more metal-rich and, as a consequence, redder.
Full Text
Using spectral synthesis models developed for SN 2017iuk, we show that these features are characterized by chemical abundances that differ from those observed in the ejecta of SN 2017iuk at later times.
Full Text
Although there have been numerous studies of chemical abundances in the Galactic bulge, the central two degrees have been relatively unexplored due to the heavy and variable interstellar extinction, extreme stellar crowding, and the presence of complex foreground disk stellar populations.
Full Text
Using ESO VLT/FLAMES spectra, we measure the chemical abundances of Y, Ba, La, Nd, and Eu, in 98 stars covering $-2.
Full Text
Spectra emitted from ionized nebulae typically contain collisionally excited and recombination lines, which can be used to trace physical conditions and chemical abundances of the interstellar medium in our Galaxy and other galaxies.
Full Text
Using the Modules for Experiments in Stellar Astrophysics code and considering the effects of WD's mass, mass-accretion rate and the chemical profiles of WD which are described by new parameter --- mixing depth on the chemical abundances of nova ejecta, we investigate the possibility that bimodal dust species are produced in a nova eruption.
Full Text
We can now measure the chemical abundances in those old stars, which is similar to a genetic fingerprint that allows us to identify the parents.
Full Text
We determined the main atmospheric parameters, kinematic properties, orbital parameters, and stellar ages for 109 newly observed stars and chemical abundances of 23 chemical species for 249 F, G, and K dwarf stars observed in the present study and in our previous study.
Full Text
As a result, among the galaxies of its class Bootes I now has the largest sample of stars (11) with a homogeneous set of atmospheric parameters and chemical abundances, and this makes it the most promising for studying the chemical evolution of UFD galaxies.
Full Text
Chemical abundances of eight different elements were obtained.
Full Text
In our work we obtained the stellar parameters and chemical abundances of 24 elements (O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Co, Sc, Ni, Cu, Zn, Y, Zr, Ba, La, Ce, Eu, Nd and Dy).
Full Text
Observations of an accretion disk around a hot white dwarf star reveal that the chemical abundances in its disk are similar to those thought to exist deep in icy giant planets, so the white dwarf must be accreting a giant planet.
Full Text
Chemical abundances were determined from the spectra for 40 stars of the sample.
Full Text
As far as the p-capture elements are concerned, the chemical abundances are typical of 1G stars, as expected from the location of our targets in the ChM.
Full Text
We estimated the spectroscopic contamination level, $\textit{v sin i}$, activity, stellar parameters and chemical abundances for 249 of the most promising targets.
Full Text
We presented distributions of chemical abundances in the $V_{\phi}$ versus \textit{R} coordinate.
Full Text
Furthermore, by combining them, a better constraint might be attained for star formation history and chemical abundances of subpopulations in GCs.
Full Text
The exploration of the spatial distribution of chemical abundances in star-forming regions in galactic discs provides clues to understand the complex interplay of physical processes that regulate the star formation activity and the chemical enrichment across a galaxy.
Full Text
Our objective is also to characterise its seven evolved stars by deriving their atmospheric parameters and chemical abundances.
Full Text
Shallower metallicity gradients derived from HII regions produce unreasonably large corrections, suggesting that the use of chemical abundances derived from such tracers as a proxy for Cepheid metallicity is unreliable.
Full Text
A wide spread of chemical abundances within the Arcturus stream indicates that the group is not a dissolved open cluster.
Full Text
For the remaining single stars we derived the stellar parameters, extinction, radial and projected rotational velocities, and chemical abundances for 21 species with atomic number up to 40.
Full Text
We compare differential abundances of several stars from the Hyades and Praesepe tails: the stars that differ more in chemical abundances also have distinct kinematics, even though they have been identified as members of the tail.
Full Text
Planetary nebulae (PNe) are oldand intermediate-age star remnants and their chemical abundances can be obtained up to 3-4 Mpc.
Full Text
We present an analysis of the chemical abundances and kinematics of six low-mass dwarf stars, previously claimed to be candidate hypervelocity stars (HVSs).
Full Text
To this end, we study the spectral energy distribution of LS V+22 25 and perform a quantitative spectroscopic analysis that includes the determination of chemical abundances for He, C, N, O, Ne, Mg, Al, Si, S, Ar, and Fe.
Full Text
We find that the method works very well in disk midplane and surfaces regions, where approximately 20-30 gas phase species, connected by $\sim$50-60 gas phase reactions, are sufficient to reproduce the targeted ionization fraction and chemical abundances.
Full Text
Using the model atmosphere method, we determined the fundamental parameters and chemical abundances in the atmosphere approving the status of a post-AGB star for V1648 Aql.
Full Text
First, we find that a combination of models with minimal assumptions and broadband transmission spectra with current facilities allow precise estimates of chemical abundances.
Full Text
A key difference between the 1D and 2D models is in the chemical abundances.
Full Text
Omega Cen can be classified as an extreme Type II GC, with a ChM displaying three main streams, each with its own variations in chemical abundances.
Full Text
Chemical abundances and abundance ratios measured in galaxies provide precious information about the mechanisms, modes and time scales of the assembly of cosmic structures.
Full Text
The chemical abundances demonstrate that both systems are clearly galaxies and not globular clusters.
Full Text
We used a non-NLTE analysis in a self-consistent semi-automatic routine based on TLUSTY and SYNSPEC to determine atmospheric parameters and chemical abundances.
Full Text
Here, we verify the large N overabundance of 2M12451043+1217401 and re-determined the chemical abundances for a wider range of chemical species, including light and heavy elements.
Full Text
To what extent do small-scale processes, such as star formation and black-hole accretion, affect global galaxy properties such as stellar masses, star formation rates and chemical abundances?.
Full Text
We examine the chemistry, kinematics, and dynamics of this metal-rich halo sample using chemical abundances and radial velocities provided by the fourteenth APOGEE data release (DR14) and proper motions from the second Gaia data release (DR2).
Full Text
Galactocentric radii and chemical abundances were collected from the literature, carefully selecting a homogeneous sample for each galaxy.
Full Text
We segment this predominantly photoionised region of study into elliptical annuli on the basis of the H$\alpha$ flux distribution to study the variation of chemical abundances and their ratios, and find no significant chemical variation.
Full Text
While the innermost halo and Gaia Enceladus regions have chemical abundances consistent with high- and low-$\alpha$ populations in the halo, respectively, chemical abundances of stars in the high-energy retrograde halo are different from the two populations; their [{X}/{Fe}], where X represents Na, Mg, and Ca, are even lower than those in Gaia Enceladus.
Full Text